JPS5919241Y2 - solar collector heat collector - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solar heat collector (hereinafter referred to as a collector), and particularly relates to the configuration of a heat collector.

Recent evacuated glass tube type collectors are designed to improve heat collection efficiency by providing a reflective section at the bottom of the inner surface of the glass tube, as shown in FIGS. 1 and 2.

In the figure, 1 is an outer glass tube that serves as a transparent cover and a vacuum container.

2 is a heat collecting pipe, and its outer circumferential surface, which becomes the heat receiving part, has
A sunlight selective absorption film 3 is formed.

Note that this figure shows an example in which a heat pipe is used as the heat collecting pipe 2.

4 is a seal plate at the end of the outer glass tube.

The sealing plate 4 is made of iron, nickel, etc. whose expansion coefficient is similar to that of glass in order to maintain a good fusion state with the outer glass tube 1.
It is made of a chromium alloy or the like, and is fused to the outer glass tube 1 using a sealing material 5 such as a low-melting glass frit.

Moreover, it is brazed to the heat collecting pipe 2. 6 is a space surrounded by the outer glass tube 1 and the seal plate 4, and is a vacuum section formed by evacuating the chip tube 7 with a vacuum pump and sealing the chip tube.

Further, the heat collecting pipe 2 is installed at a predetermined position inside the outer glass tube 1 with a spacer (not shown).

Note that the end seal can be omitted by making the seal plate 4 made of glass and processing it integrally with the outer glass tube 1.

Reference numeral 8 denotes a reflecting mirror provided on the inner peripheral surface of the lower part of the outer glass tube 1, and is made by vacuum evaporation of aluminum or the like.

The heat collecting pipe 2 is thus heated by solar energy, either directly or via a reflector, and evaporates the heat pipe working fluid sealed within the pipe.

This vapor moves towards the condensing section 2' and condenses there.

The latent heat of condensation at this time heats the medium to be heated, such as water, flowing inside the header 9.

Although such a collector certainly has good heat collection efficiency, the heat collection pipe 2 must be installed at a position eccentric from the center of the glass tube 1 as shown in the figure, and the sealing work of the heat collection pipe 2 to the glass tube 1 is difficult. In addition, the reflector 8 must be attached to the inner surface of the glass tube, which makes the collector manufacturing work very difficult.

Therefore, in order to facilitate the sealing work of the heat collecting pipe 2 to the glass tube 1, it is being considered to provide the heat collecting pipe 2 on the central axis of the glass tube 1, but in that case, the position of the reflector 8 would have to be changed. In this case, the light condensing efficiency of the reflecting mirror 8 onto the pipe 2 is significantly reduced, so that the reflecting mirror 8 must be floated upward by about 1/4 of the diameter of the glass tube 1.

That is, in FIG. 3, if the glass tube 1 is a circle with a radius R and the center point O, the reflecting mirror 8 is a circle t with a radius R whose center P is located at R/2 above the perpendicular line AB passing through the center O. It must be brought to a position corresponding to the lower arc.

In this case, the lowest point of the reflecting mirror 8 will be located above the lowest point of the glass tube 1 by R/2.

The positional relationship between the reflecting mirror 8 and the heat collecting pipe 2 is disclosed in, for example, Japanese Patent Application Laid-Open No. 52-140932.
There is no disclosure of specific means for naturally arranging the above positional relationship.

Therefore, the present invention has a heat collecting pipe 2 and a reflector 8 inside the glass tube 1.
The object of the present invention is to provide a concrete means for easily installing the above-mentioned positional relationship.

Another object of the present invention is to facilitate the manufacture of the collector and improve the yield.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 4 is a perspective view of the main parts of the heat collector installed inside the glass tube 1, which is mainly composed of a retaining ring 10, a heat collecting pipe 11, and a reflecting mirror 12.

The retaining ring 10 is slidably inserted along the inner surface of the glass tube 1 to hold the heat collecting pipe 11 and the reflecting plate 12 in a predetermined positional relationship within the glass tube 1, and its outer diameter is the same as the inner diameter of the glass tube 1. A circular frame body as shown in FIG.

Reference numerals 13 and 13 denote guide grooves for holding the reflection plate 12, which are bored in the axial direction so as to face each other on the inner surface of the holding ring 10, and in the case of the embodiment, they are located on the diameter passing through the center of the ring 10. , there is no problem if it is located anywhere as long as it corresponds to a chord position below points E and F in Figure 3.

Reference numerals 14 and 14 denote three holding pieces made of elastic material fixed to the outer periphery of the holding ring 10 at approximately equal angular intervals, each of which extends in the axial direction so as to be inclined outward.

This holding piece 14 comes into contact with the inner surface of the glass tube 1 when the ring 10 is inserted into the glass tube 1, and has the role of stably holding the ring 10 inside the glass tube 1. A rounded protrusion 15 is provided at the outer tip.

Reference numeral 16 denotes a holding end plate 17 welded to the inner peripheral surface of the ring so as to cover about half of the end surface of the ring 10, which has a fan shape as shown in FIG. A hole 18 is formed.

This holding hole 18 is located on the central axis of the ring 10 when the end plate 16 is fixed to the inner surface of the ring 10 as shown in FIG.

Therefore, if the heat collecting pipe 11 is inserted into this holding hole, this pipe 11 will be provided along the center of the ring 10, that is, along the central axis of the glass tube 1.

The reflector plate 12 has flanges 19.1 on both sides as shown in FIG.
9, and the cross section is an arc having the same radius as the glass tube 1.

As shown in FIG. 4, this reflecting plate 12 is inserted into the guide grooves 13, 13 of the retaining ring 10 with flanges 19, 19 and held, and the positional relationship with the glass tube 1 and the heat collecting pipe 11 is as shown in FIG. It is positioned so that

Therefore, when forming the heat collector, the holding piece 14. End plate 16
is fixed in a predetermined position of the retaining ring 10, the heat collecting pipe 11 is inserted into the retaining hole 18 of the end plate 16 and fixed by welding, and finally the reflecting plate 12 is inserted along the guide groove 13.13 of the ring 10. The assembly work is extremely simple.

Although only one retaining ring 10 is used in FIG. 4, normally another retaining ring 10 is provided at the other end 12a of the reflector 12, and two retaining rings 10 are used.
The structure is such that the heat collecting pipe 11 and the reflecting plate 12 are connected in series with each other between 0.10 and 0.10.

However, there is no significant difference in the assembly work.

Further, since the width of the retaining ring 10 is approximately 5 to 1Q mm, the number of retaining rings used varies depending on the length of the glass tube 1, that is, the length of the heat collecting pipe 11, but at most 3 to 4 pieces are used for a length of 2 m. You can use

When the heat collector formed in this way is installed inside the glass tube 1, it is only necessary to slide the retaining ring 10 into sliding contact with the inner surface of the iron tube 1. 12 is held in place.

In this case, the holding pieces 14.14 soften the impact when inserting the heat collector, smooth the slide inside the glass tube 1, and stably hold the holding ring 10 inside the glass tube 1.

In addition, when the number of retaining rings 10 is one as shown in FIG.
The other end 12a of the reflector 12 is held slidably in the axial direction by a seal plate holder formed inside the seal plate 4 shown in FIG. The above-mentioned heat collector, which only needs to be attached, is solidly formed in advance outside the glass tube 1, and no special jig is required when inserting it into the glass tube 1, so the insertion work is very easy. In addition, the heat collector does not bend or undergo deformation such as twisting when inserted, and the incidence of defective products is extremely low.

Furthermore, when the heat collector is installed inside the glass tube 1, the end of the heat collecting pipe 11 protrudes outward from the seal plate of the glass tube 1, but this protruding portion is located at the center of the glass tube 1, that is, the seal plate. Since it is in the center, when the pipe 11 is extended due to thermal expansion, the force applied to the sealing part between the glass tube 1 and the sealing plate through the sealing plate is uniform over the entire circumference, making it difficult to damage the sealing part. Become.

In addition, although the heat collection pipe 11 and the retaining ring 10 of the heat collector are fixed, the reflecting plate 12 and the retaining ring 10 are not fixed, so the thermal expansion coefficients of the pipe 11 and the reflecting plate 12 are different. Also, the heat collector will not be deformed within the glass tube 1.

This is because even if the retaining ring 10 moves within the glass tube 1 following the expansion and contraction of the pipe 11, the reflecting plate 12 does not follow the movement of the retaining ring 10 and expands and contracts independently.

(Other Examples) (1) The heat collecting pipe may be either a heat pipe or a water pipe.

Further, the heat collecting pipe may be of a type that passes through the glass tube 1, or may be of a type that is bent into a U-shape within the glass tube 1 and led out from a common opening of the glass tube 1.

(2) The reflecting plate 12 does not need to be made of metal; it may be made of an elastic plate such as mica, and may have an aluminum coating on its reflecting surface.

If the reflector plate 12 has elasticity, it will be more securely engaged with the retaining ring 10.

(3) When forming the heat collector, the holding end plate 16 may be welded to the heat collecting pipe 11, and the outer peripheral portion of the holding end plate 16 may be welded and fixed to the inner surface of the retaining ring 10.

Since the heat collector of the present invention has an inclined configuration, it is not only possible to accurately set the heat collecting pipe and the reflector in a predetermined positional relationship with respect to the transparent container by simply inserting it into the transparent container. No special jig is required for inserting the heat collector into the transparent container.

Therefore, compared to the case where the heat collecting pipe and the reflecting plate are individually positioned, the positional relationship between them is not only more accurate, but also the manufacturing work of the collector is greatly simplified.

Furthermore, since the retaining ring and the heat collecting pipe are fixed, the heat collecting body is very strong, and the heat collecting body will not be deformed when inserted into the transparent container.

Furthermore, if the reflector is slidably locked in the axial direction with respect to the retaining ring, there is an advantage that even if the thermal expansion length due to solar heat differs between the heat collecting pipe and the reflector, the reflector will not be deformed.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional collector, and Figure 2 is its a-
A sectional view, FIG. 3 is an explanatory diagram explaining the positional relationship of the reflector, the heat collecting pipe, and the glass tube, FIG. 4 is a perspective view of the main part of the heat collector of the present invention, FIGS. 5, 6, FIG. 7 is a perspective view of the retaining ring, the retaining end plate, and the reflecting plate shown in FIG. 4, respectively. Code 10: Retaining ring, 11: Heat collecting pipe, 12: Reflector plate.

Claims (1)

[Scope of utility model registration request] 1. In a solar heat collector installed inside a cylindrical transparent container to receive solar heat, a retaining ring is provided inscribed in the inner peripheral surface of the transparent container to prevent displacement in the radial direction, and the retaining ring The heat collecting pipe is attached and fixed in the axial direction of the ring by a holder extending inward from the ring, and at least two holding guides are provided on the inner surface of the holding ring, and the holding guide allows the heat collecting pipe to be fixed in the axial direction of the ring. A heat collecting body for a solar heat collector, comprising an extending gutter-shaped heat collecting reflecting plate, which is positioned below the heat collecting pipe by locking both sides of the reflecting plate. 2. Hold the above retaining ring at least 2 times at a predetermined interval.
A heat collector for a solar heat collector according to claim 1, which is a registered utility model, characterized in that the heat collecting pipe and the light collecting reflector are arranged in series between the retaining rings. 3. Utility model registration claim 1 or 2, wherein the holding guide is formed along the axial direction of the holding ring, and the holding guide locks the reflecting plate so as to be slidable in the axial direction. Heat collector of the solar collector described. 4. The holding ring has a circular shape inscribed in the cylindrical transparent container, holds the heat collecting pipe along the central axis of the holding ring, and has a reflective plate stretched between the holding guides.Registered as a utility model. A heat collecting body for a solar heat collector according to claim 1, 2, or 3.